電容去離子技術(Capacitive deionization，CDI)為近年來新興的海水淡化技術，活性碳(Activated carbon，AC)作為主流的電極材料，具有多孔高比表面積等優勢，本研究使用離子型界面活性劑修飾活性碳電極，透過改變活性碳電極表面電位提升去除性能，且提升銨離子的選擇性，研究中分別利用陰離子型界面活性劑十二烷基硫酸鈉(Sodium dodecyl sulfate，SDS)修飾活性碳，利用SDS-AC作為陰極，提升銨離子的選擇性，陽極則是使用陽離子型界面活性劑溴化十六烷基三甲銨(Hexadecyltrimethylammonium bromide，CTAB)修飾的CTAB-AC，在施加反向電壓脫附時保護陽極減少陽離子的吸附。於研究中，使用循環伏安法來分析電極之電化學特性，結果顯示電容量陽極最高為72.36 F/g，陰極為65.96 F/g，並在模擬水樣及真實水樣中得到相較活性碳電極，更優秀的吸附量以及回收率，並且對銨離子的選擇性能得到提升，。以循環伏安法連續掃描電極50次，其圖形不隨掃描次數改變，而在連續式電容吸附實驗反覆充放電十次的情形下，離子濃度變化具有穩定的趨勢，電極並無明顯衰退。;Capacitive deionization (CDI) is an emerging desalination technique. Activated carbon (AC) serves as the mainstream electrode material, possessing advantages such as a high porous surface area. In this study, surfactants were used to modify the activated carbon electrode to enhance the selectivity of ammonium ions by controlling the surface potential. Anode was modified by SDS (sodium dodecyl sulfate) as SDS-AC and cathode was modified by CTAB (hexadecyltrimethylammonium bromide) as CATB-AC. Cyclic voltammograms showed that the maximum capacitance of the anode was 72.36 F/g and that of the cathode was 65.96 F/g. Compared to activated carbon electrodes, SDS-AC and CTAB-AC exhibited superior adsorption capacity and recovery ability in simulated and real water samples, with improved selectivity for ammonium ions. Upon 50 cycle of scanning, the cyclic voltammogram remained unchanged, whereas in repeated charge-discharge experiments of continuous capacitance adsorption, the ion concentration exhibits a stable trend without significant degradation.
